/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraPreviewGrid.h
Applies this axis for the preview at PreviewIndex on this axis.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintNativeEvent) void ApplyToPreview ( [UNiagaraComponent](API\Plugins\Niagara\UNiagaraComponent) * PreviewComponent, int32 PreviewIndex, bool bIsXAxis, [FString](API\Runtime\Core\Containers\FString) & OutLabelText )